package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.SeckillVoucherMapper;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.Collections;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucherService;
    @Resource
    private RedisIdWorker redisIdWorker;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private RedissonClient redissonClient;
    /**
     * 创建订单
     *
     * @param voucherId
     * @return
     */
    private static final DefaultRedisScript<Long> SECKILL_SCRIPT;

    static {
        SECKILL_SCRIPT = new DefaultRedisScript<>();
        SECKILL_SCRIPT.setResultType(Long.class);
        SECKILL_SCRIPT.setLocation(new ClassPathResource("seckill.lua"));
    }
    private IVoucherOrderService   proxy;
    @Override
    public Result createOrder(Long voucherId) {
        //获取用户id
        Long userId = UserHolder.getUser().getId();
        //订单id
        long orderId = redisIdWorker.nextId("order");
        Long result = stringRedisTemplate.execute(SECKILL_SCRIPT,
                Collections.emptyList(),
                voucherId.toString(), userId.toString(),String.valueOf(orderId));
        //2判断结果是否为o
        if (result != 0) {
            return Result.fail(result == 1 ? "库存不足" : "不能重复下单");
        }
        //当前有资格购买

        // 获取代理对象
        proxy= (IVoucherOrderService) AopContext.currentProxy();
        //返回订单

        return Result.ok(orderId);
    }


//    @Override
//   // @Transactional(rollbackFor = Exception.class)
//    public Result createOrder(Long voucherId) {
//        //1.查询优惠券
//        SeckillVoucher seckillVoucher = seckillVoucherService.getById(voucherId);
//        //2.判断秒杀是否开始
//        if (seckillVoucher.getBeginTime().isAfter(LocalDateTime.now())) {
//            return Result.fail("秒杀未开始！");
//        }
//        //3.判断秒杀是否结束
//        if (seckillVoucher.getEndTime().isBefore(LocalDateTime.now())) {
//            return Result.fail("秒杀已结束！");
//        }
//        //4.判断库存是否充足
//        if (seckillVoucher.getStock() < 1) {
//            return Result.fail("库存不足！");
//        }
//        Long userId = UserHolder.getUser().getId();
//        //创建锁对象
//        //SimpleRedisLock lock = new SimpleRedisLock(stringRedisTemplate,"order"+userId);
//        RLock lock = redissonClient.getLock("lock:order:" + userId);
//        //获取锁
//        boolean isLock = lock.tryLock();
//        if(!isLock){
//            return Result.fail("不允许重复下单！");
//        }
//        try {
//            //执行业务
//            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
//            return proxy.createVoucherOrder(voucherId);
//        } finally {
//            //释放锁
//            lock.unlock();
//        }
//    }

//    @Transactional
//    public Result createVoucherOrder(Long voucherId) {
//        //5.一人一单
//        Long userId = UserHolder.getUser().getId();
//        Integer count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();
//        if (count > 0) {
//            return Result.fail("用户已经购买过！");
//        }
//        //6.扣减库存
//        boolean success = seckillVoucherService.update()
//                .setSql("stock=stock -1")
//                .eq("voucher_id", voucherId)
//                .gt("stock", 0)
//                .update();
//        if (!success) {
//            return Result.fail("库存不足！");
//        }
//        //7.创建订单
//        VoucherOrder voucherOrder = new VoucherOrder();
//        long id = redisIdWorker.nextId("voucherOrder");
//        voucherOrder.setId(id);
//        voucherOrder.setVoucherId(voucherId);
//        voucherOrder.setUserId(UserHolder.getUser().getId());
//        save(voucherOrder);
//        //8.返回
//        return Result.ok(id);
//
//    }
}
